Correct.38. Which element has the most stable nucleus? (3 points)Score Board:sum41rocksandrolls-26Odorskeut- 17Pompous Pom-poms-13Amnesiac-12aschen-10Eärendil- 100 vert 0-9DVS_2006-8Monomer-6hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
Science quiz
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Guest_Mirai Naza
, Jun 04 2006 09:42 PM
981 replies to this topic
#176
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Posted 14 July 2006 - 05:13 AM
#177
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Posted 14 July 2006 - 06:35 AM
Is it Helium?
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#178
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Posted 14 July 2006 - 07:26 AM
i wouldve thought carbon, but thats just a guess
#179
Guest_archmage1991
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Posted 14 July 2006 - 07:39 AM
noble gases? like helium what that guy said
#180
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Posted 14 July 2006 - 10:14 AM
The most stable nucleus is actually the Iron 56 Nucleus, it has the lowest binding energy per nucleon of all nuclei.This is why normal stellar evolution cannot create nuclei heavier than iron. Heavier nuclei can only be created by more dramatic processes like supernovae.
#181
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Posted 14 July 2006 - 03:51 PM
well tin has the most stable isotopes.
#182
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Posted 15 July 2006 - 10:04 AM
Sorry for being late. Monomer get the correct answer. Helium and other rare gases have very stable nuclei but iron has the most stable.39. What is called 'supraconduction'? (2 points)Score Board:sum41rocksandrolls-26Odorskeut- 17Pompous Pom-poms-13Amnesiac-12aschen-10Eärendil- 100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#183
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Posted 15 July 2006 - 06:34 PM
I think it's somethink like the property of systems of certain metal atoms at low temperatures but I really don't understand it.
#184
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Posted 15 July 2006 - 06:39 PM
You are close but can you be more precise? What is the property you are talking about? The part on low temperature is correct.
#185
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Posted 15 July 2006 - 06:49 PM
I remember now. There is no magnetic field around the material but can only happen at very low temperatures.
#186
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Posted 15 July 2006 - 06:59 PM
Ok, that's not very accurate but since you somehow the idea, I'll go on the next question. Supraconductivity is the property of material at low temperature to present no resistance to electric current. An additional property is to oppose to all extreme magnetic field.40. Conditioning on its existence, what is called the intermediary of gravitational force? (3 points)Score Board:sum41rocksandrolls-27Odorskeut- 17Pompous Pom-poms-13Amnesiac-12aschen-10Eärendil- 100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#187
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Posted 15 July 2006 - 07:32 PM
Couldn't the answer to this be several things? Since it is only a suggested thing?
#188
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Posted 15 July 2006 - 07:39 PM
Actually, there is only one answer. Like photon is the intermediary of electrmagnetic and weak forces, [answer] is the intermediary of gravitational force but no one ever managed to detect it for now: its existence is only supposed.
#189
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Posted 15 July 2006 - 07:54 PM
well all I can think of is a Graviton but that really has a lot to do with the quantum field theory but it has not yet been detected.
#190
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Posted 15 July 2006 - 07:59 PM
Correct answer. In the same field:41. Conditionning on its existence, why has the graviton not been discovered yet? (3 points)Score Board:sum41rocksandrolls-30Odorskeut- 17Pompous Pom-poms-13Amnesiac-12aschen-10Eärendil- 100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#191
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Posted 15 July 2006 - 08:19 PM
well it's not every day we see a star get swolled into a black hole and are able to do and experiment then but because gravity is such a weak force we have no way of breaking apart if I remember correctly (I got a C in this class)
#192
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Posted 15 July 2006 - 08:26 PM
Correct answer. Since gravity is a very weak force (the weakest of the four fundamental forces), graviton are extremely sparse (if any) and therefore it is very hard to detect a graviton.42. What anomaly does Mercury has according to classical mechanics and is explained perfectly by general relativity? (3 points)Score Board:sum41rocksandrolls-33Odorskeut- 17Pompous Pom-poms-13Amnesiac-12aschen-10Eärendil- 100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#193
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Posted 15 July 2006 - 11:41 PM
I don't know it exactly, but I think it was that according to Newton's calculation, Mercury wasn't where it was supposed to be, but it was in the right place with Einstein's theory. It was that because the gravitational field will curve the light making it appear somewhere else.
He saw the Mountain silent rise
where twilight lies upon the knees
of Valinor, and Eldamar
beheld afar beyond the seas.
#194
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Posted 16 July 2006 - 03:00 AM
Well, I think you got the point even if it is actually more accurate. Mercury, due to its close distance to the sun (high gravity field), have a trajectory that is considered as anmalous by classical mechanics. More precisely, Mercury has a perihelion that is in advance compared to the theoretical one. This anomaly is however perfectly explained by general relativity and has contributed to the general acceptance of Einstein's theory.49. Why classical mechanics cannot explain the stability of hydrogen atom? (4 points)Score Board:sum41rocksandrolls-33Odorskeut- 17Eärendil- 13Pompous Pom-poms-13Amnesiac-12aschen-100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#195
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Posted 16 July 2006 - 03:38 AM
the hydrogen atom in which a negativelycharged electron orbits a concentrated positivelycharged proton. However, classically this presents aproblem. An accelerated charge revolving with afrequency should radiate electromagnetic waves atthe same frequency. Would you like the equation that goes with it?
#196
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Posted 16 July 2006 - 04:19 AM
Almost corretc, you didn't reach the conclusion however. All you said is correct though. To complete the answer: since a revolutionning electron radiates, thus loses energy and will eventually collapse on the proton, rending the atom instable. Bohr proposed a model of hydrogen where electron doesn't lose energy on certain trajectory: it's the beginning of quantification.50. What is the most common 'elements' that has a greater volume when solid than when liquid? (2 points)Score Board:sum41rocksandrolls-37Odorskeut- 17Eärendil- 13Pompous Pom-poms-13Amnesiac-12aschen-100 vert 0-9Monomer-9DVS_2006-8hackerx-5Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#197
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Posted 16 July 2006 - 10:17 AM
That one is simple.H2O
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#198
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Posted 16 July 2006 - 01:57 PM
Yes, it was simple.51. Why do some butterflies have different colors on their wings? (3 points)Score Board:sum41rocksandrolls-37Odorskeut- 17Eärendil- 13Pompous Pom-poms-13Amnesiac-12aschen-100 vert 0-9Monomer-9DVS_2006-8hackerx-7Mirai Naza- 5Escaler-3Simbird-3Kewne-2random dude-2simbot15-2lumba-1
#199
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Posted 16 July 2006 - 02:31 PM
Ummm, that one is a little vague. Are you talking butterflies from a particular part of the world, a class of butterfly, betterflies in general or what? There are around 20,000 different kinds of butterfly after all. There are several different reasons as possible answers.Blending with surroundings as part of evolution, attracting mates, developing patterns to scare away predators, etc.....Different sub classifications of butterflies do different things.Yes, it was simple.51. Why do some butterflies have different colors on their wings? (3 points)
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#200
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Posted 16 July 2006 - 02:57 PM
Well, you are perhaps right, my question is not as clear as I supposed. What i mean is not the biological and evolutionary reasons that make some butterflies have colorful wings. The answer I want is "what are the physical properties of some butterfies wings that make them colorful?" For example, similarly, if I ask, "why most trees are green?", the answer should be "because their leaves reflect mainly wavelengths that are close to green".
